U.S. Department of Housing and Urban Development (HUD) Secretary Ben Carson was once one of the world's most famous neurosurgeons, saving the lives of children with complex and deadly health conditions. With faith as his guide, the celebrated doctor took on procedures that had never been successfully performed — and helped pave new ground in neuroscience.

At that point, the exact opposite happened, and the boy started to improve. After conducting more scans, Carson realized that the child's tumor was potentially not attached to the brain stem. He conducted another surgery and found that his theory was correct.

To Carson's surprise, he was able to totally remove the tumor — and save the little boy's life.

"He walked out of the hospital and today is a minister," Carson said of the child.

The miraculous healing was so shocking that an oncologist who didn't believe much in faith later approached Carson with a stunning admission.

"[The oncologist] said, 'I've never been a believer, but I am now,'" Carson said.

In the end, though, Carson believes the ordeal was a lesson for him, as he had a high view of himself at the time. He was a doctor who had achieved so much at a young age, but that healing showed him that it was God who guided his successes, not himself.

"I said, 'Lord, from now on you be the neurosurgeon and I'll be the hands,'" Carson said.

Watch Carson's full "Pure Talk" interview:

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Billy Hallowell, author of "The Armageddon Code," has contributed to TheBlaze, the Washington Post, Human Events, the Daily Caller, Mediaite, and the Huffington Post, among other news sites. Through journalism, media, public speaking appearances, and the blogosphere, Hallowell has worked as a journalist and commentator for more than a decade.